A thin hose utilized as back-flow hose to the container will be mounted on the pressure side of the pump. In case of a damage of the discharge hose the liquid would be automatically pulled out of the container by physical law without siphon-protection until the liquid level in the container will have reached the level of the leakaging damaged hose. The siphon-protection priciple interrupts by air aspiration through the thin back-flow hose the automatic liquid pull-out immediately.

Please note for an optimal function: To avoid a malfunction the back-flow hose shall never be in contact with the liquid!